Department of Animal Sciences and Industry, College of Agriculture, Kansas State University, Manhattan, KS.
Department of Grain Sciences and Industry, College of Agriculture, Kansas State University, Manhattan, KS.
J Anim Sci. 2018 Jun 4;96(6):2278-2292. doi: 10.1093/jas/sky147.
Three experiments were conducted to evaluate the effects of roller mill configuration on growth performance of nursery and finishing pigs, feed preference, and feed mill throughput. The four experimental treatments included corn ground through a roller mill using two, three, four sets of rolls in a fine-grind configuration, or four sets of rolls in a coarse grind configuration. The same roller mill was used for all configurations with the appropriate lower rolls completely open when using the two or three roll pair configurations. Across all studies, mean particle size averaged approximately 540, 435, 270, and 385 µm for the four roller mill configurations, respectively. In Exp. 1, 320 pigs (DNA 400 × 200, initially 10.7 ± 0.27 kg BW) were randomly allotted to treatments with five pigs per pen and 16 pens per treatment in a 21-d growth trial. While there were no evidence of differences observed for ADG or ADFI, pigs fed corn ground using the 4-high coarse configuration had a marginally significant (P = 0.091) improvement in G:F compared with those fed with the 2-high configuration, with others intermediate. In Exp. 2, 90 pigs (PIC 327 × 1050, initially 12.1 ± 0.25 kg BW) were randomly allotted to one of three diet comparisons to determine feed preference between the 2-high, 4-high fine, and 4-high coarse configurations. When given a choice, pigs consumed more (P < 0.05) of the diet containing corn ground through the 2-high roller mill (67%) or 4-high coarse configuration (63%) compared with corn ground through the 4-high fine configuration. In Exp. 3, 922 finishing pigs (PIC TR4 × [FAST Large white × PIC Line 2], initially 40.1 ± 0.36 kg BW) were used in a 97-d experiment with pens of pigs randomly allotted by initial BW to the same experimental treatments used in Exp. 1. There were 21 pigs per pen and 11 pens per treatment. Pigs fed corn ground with the 2-high configuration had greater (P < 0.05) ADG compared with those fed corn ground using the 3-high configuration. Pigs fed corn ground with the 4-high fine configuration had the poorest (P < 0.05) ADG. No differences were observed in G:F. Grinding rate (tonne/h) was greatest (P < 0.05) for the 4-high coarse configuration, while net electricity consumption (kWh/tonne) was lowest (P < 0.05) for the 2-high configuration and greatest for the 4-high fine configuration. In summary, nursery pig G:F tended to be greatest using the 4-high coarse configuration, and finishing pig ADG was maximized using the 2- and 4-high coarse configurations.
进行了三项实验来评估辊式磨配置对育肥猪和肥育猪生长性能、饲料偏好和饲料厂吞吐量的影响。四个实验处理包括通过使用两、三、四组辊的细磨配置或四组辊的粗磨配置在辊式磨中研磨的玉米。相同的辊式磨用于所有配置，当使用两个或三个辊对配置时，适当的下辊完全打开。在所有研究中，平均粒径分别约为 540、435、270 和 385µm，用于四个辊式磨配置。在实验 1 中，320 头猪（DNA 400×200，初始体重 10.7±0.27kgBW）随机分配到五个猪圈的每个猪圈中，每个处理 16 个猪圈，进行 21 天的生长试验。虽然没有观察到 ADG 或 ADFI 的差异，但与使用 2 高配置相比，使用 4 高粗磨配置研磨的玉米喂养的猪的 G:F 有轻微的提高（P=0.091），而其他的则介于两者之间。在实验 2 中，90 头猪（PIC 327×1050，初始体重 12.1±0.25kgBW）随机分配到三个饲料比较之一，以确定 2 高、4 高细和 4 高粗配置之间的饲料偏好。当有选择时，与通过 2 高辊式磨（67%）或 4 高粗磨（63%）研磨的玉米相比，猪消耗了更多（P<0.05）的含有玉米的饲料。在实验 3 中，922 头肥育猪（PIC TR4×[FAST Large white×PIC Line 2]，初始体重 40.1±0.36kgBW）在 97 天的试验中使用，每个猪圈的猪根据初始体重随机分配到与实验 1 中使用的相同的实验处理。每个猪圈 21 头猪，每个处理 11 个猪圈。与使用 3 高配置相比，用 2 高配置研磨的玉米喂养的猪的 ADG 更高（P<0.05）。用 4 高细磨配置研磨的玉米喂养的猪的 ADG 最差（P<0.05）。在 G:F 方面没有观察到差异。研磨率（吨/小时）最高（P<0.05）为 4 高粗磨配置，而 2 高配置的净电耗（千瓦时/吨）最低（P<0.05），4 高细磨配置的电耗最高。总之，使用 4 高粗磨配置时，育肥猪的 G:F 往往最大，使用 2 高和 4 高粗磨配置时，肥育猪的 ADG 最大。
